You have the incorrect I2C address for the part. The confusing bit (no pun intended) is that the Wire library takes care of the read/write bit automatically for you. This means that you need to drop the low bit and shift the address bits to the right by one position. In your case the address you would need to use is 0x53 (0xA6 or 0xA7 shifted right one position after dropping the low bit).